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Chicken eggs are graded by size, for the purpose of sales. The egg shell constitutes 8–9% of the weight of the egg (calculated from data in Table 2, F. H. Harms). [1] A scale for grading eggs. An egg scale that was patented in 1924
Ostrich eggs are the largest of all eggs, [4] though they are actually the smallest eggs relative to the size of the adult bird — on average they are 15 cm (5.9 in) long, 13 cm (5.1 in) wide, and weigh 1.4 kilograms (3.1 lb), over 20 times the weight of a chicken's egg and only 1 to 4% the size of the female. [5]
A study of female greater prairie-chickens in Kansas found that their survival rates were 1.6 to 2.0 times higher during the non-breeding season compared to the breeding season; this was due to heavy predation during nesting and brood-rearing. [28] One problem facing prairie-chickens is competition with the ring-necked pheasants. Pheasants lay ...
A chicken may live for 5–10 years, depending on the breed. [27] The world's oldest known chicken lived for 16 years. [28] Chickens are gregarious, living in flocks, and incubate eggs and raise young communally. Individual chickens dominate others, establishing a pecking order; dominant individuals take priority for access to food and nest sites.
Eggs of: ostrich, emu, kiwi and chicken. Egg size tends to be proportional to the size of the adult bird, [citation needed] from the half gram egg of the bee hummingbird to the 1.5 kg egg of the ostrich. Kiwis have disproportionately large eggs, up to 20% of the female's body weight. [18]
The largest recorded egg is from a whale shark and was 30 cm × 14 cm × 9 cm (11.8 in × 5.5 in × 3.5 in) in size. [1] Whale shark eggs typically hatch within the mother. At 1.5 kg (3.3 lb) and up to 17.8 cm × 14 cm (7.0 in × 5.5 in), the ostrich egg is the largest egg of any living bird, [ 2 ] : 130 though the extinct elephant bird and ...
In their native Oceania, indigenous peoples protect their nesting sites, as their eggs are considered to be delicacies. [14] Their eggs are about twice the size of chicken eggs and the yolks are roughly four times as massive. [15]
The space available to each hen in a battery cage has often been described as less than the size of a sheet of A4 paper (624 square centimetres (96.7 sq in)). [53] Other people have commented that a typical cage is about the size of a filing cabinet drawer and holds eight to ten hens. [14] [54]
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